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### Primary 6 Problem Sums/Word Problems - Try FREE

- Ratio: Think units and you're on your way! > Ratio Exercise 6 > 1
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- Attempt Mode: Attempt Single Question

**Score :**

(Single Attempt)

**Question
**

Initially, the ratio of the number of boys to the number of girls in school A was 3:4.

After 15 students joined school A, the ratio of the number of boys to girls became 5:6.

In the end, there were 54 girls in the school.

How many boys were there in school A at first?

The correct answer is :

**36**